Reinforcing-bar for concrete and like material.



No. 843,424. PATEN'IED FEB. 5, 1907. S. B. WILLIAMSON.

RBINFORGING BAR FOR CONCRETE AND LIKE MATERIAL.

APPLICATION FILED AUG.10, I906.

UNITED STATES PATENT OFFICE.

SYDNEY B.\V1LLIAMSON, OF BALTIMORE, MAR YLAN I). REINFORCING-BAR FOR CONCRETE AND LIKE MATERIAL.

Specification of Letters Patent.

Patented Feb. 5, 1907.

Application filed Au ust 10,1905. Serial No. 273,555.

To roll whom it may concern:

Be it known that 1, Swiss) B. WILLIAM- son, residing at Baltimore, in the State of Maryland, have invented a certain new and useful improvement in Reinforcing-Bars for Concrete and hike Material, of whicn the following is a full, clear, and exact description, reference being had to the accompanying drawings.

My invention relates to reinforcing-bars for concrete, artificial stone, or similar material used in the construction of buildings, bridges, and the like, and has for-its objects the provision of a bar of this kind that will form a rigidmechanical' bond with the material in WI ich it is embedded, that will retain a relatively large proportion of the original cross-sectional area of the stock from which the bar is formed, that will be substantially uniform in sectional area throughout its length, and that will so engage the material in which it is embedded as to greatly increase the resistance against elongation. These objects are accomplished by the bar shown in ti o drawings, w; .crcin Figure 1 represents a plan, view of a portion of a bar constructed in accordance with my invention. Figs. 2, 3, and 4 represent transverse sections on the correspondinglynumbered lines of Fig. 1 and Fig. 5 represents a plan view of a beam or similar structure, a portion thereof being broken away to show a plurality of my bars applied thereto.

' Describing the parts by numerals, 1 represents a bar constructed in accordance with my invention. Each face of the bur is provided,

gated depressions 2, preferably diamond or lozenge s1 aped, mid depressions being provided between sinuous ribs 3, which are at the original levcl ol tic surface of the stock before being subj cted to the action of the rolls. 'ii c re esses 2, as will appear more particularly from Figs. 2, ii, and 4, are dcep- 6st at the center tit-root, whence tlcy diminish gradually in depth toward the ends j 'li e ribs J3 at ti o Widest and -sides thcrcol'.

portion of tic l(tj" -:%t\ cxtcud to tic side edges of t lc li-il, limo .rnlcll ponildhc) 21pnmgb on u n r ,llUi merge ill -l iiilcilucdiate of 3 c i' wssca and ill center of "l o bar.

The 1;()I1]t' udgt's l l tlzc her are provided with T800550. 5, "H ll You sac; extendingpreferably by passing the stock through suitable rolls, with a series of clonlhc longitudinal across from the rib portion 4 on one face of 1 the bar to the portion 4 on the adjacent face. These recesses are deepest opposite the cenf tral portions 4 of the ribs and decrease uniformly in depth from these points to the junction of the ribs with the corner edges of the bar. Each recess is made up 01 two parts 5, the bottoms of which incline outwardly symmetrically from the adjacent rib toward the corner, meeting in a common vertex line 6, Which connects the junctions of the rib portions 3 and the corner edges of l the bar. The angle thus formed is within the original corner 'of the stock. T1 is construction of the recesses 5 will appear more particularly from an inspection of rigs. 2, 3, and 4 of the drawings, and, as will further appear from an inspection of said figures, the depth 01 the recesses 5 increases as the depth of the recesses 2 droxetses, and vice vex: a.

By the peculiar shape and arrangement of the recesses and ribs the bar, while retaining a very high proportion of the original crosssectional area of the stock before rolling, is of substantially constant cross-sectional area throughout its length. The provision of the ribs 3 with the recesses 2 is of great ilcportance in maintaining a rigid mcci anicnl bond between the bar and the concrete when the bar is stressed and at the same time in ennbling the concrete to resist the elongation of the bar whcn so subjected to stress. When one of these bars is subjected to stress which elongatcs the same, such elongation reduccs ti o sectional area of the bar and causes the side edges of the bur and the ribs 3, which inclosc the rcccsscs 2. to approach each other. ll' the reccsscs are iillcd with concrete, however, it c npprouci ing of ti c ribs 3 toward each other and ti o narrowing :unl elongating of it u but are resisted. 'll crel'orc, wi cii the bar is embedded in concrete, as in a beam 7, and the beam and bar are stressed, instead of shrinking away from ti o concrete it tends, through the action 01" the ribs, to grip tic concrete more iirmly will in ll 0 depressions At the same time ti o concrete in such l depressions sets'up a counteracting stress in tic bar againstelongation, wi ilc ti 0 arrangel them and location ol the recesses diminish th horizontal shear bar.

While I have shown substantially diamond or lozenge sloped rcccssos in my bar, it will be evident that the particular shape of such in the vicinity of the recesses may be varied Without departing from the spirit of my invention.

Having thus described n1 y invention, what I claim as new, and desire to secure by Letters 5 Patent, is

1. A bar for the purpose specified, said bar being polygonal in cross-section and having -entirely within each face tltereof recesses ex tending into and onl part1 through the 10 body thereof, said bar having at the intersec tion of its faces recesses intermediate t] e recesses in the faces and diminisling in depth from the longitudinal central portion to tlie ends thereof, wl.ereby a very high proportion [5 of the original cross-sectional area of tlie stock is preserved throughout its length,

shearing is reduced to a minimum and the bar is of substantially constant crosssectional area tlroughout its length, substan- 2o tially as specified.

2. A bar for tie purpose specified, said bar being polygonal in cross-section and having eaci face thereof provided with recesses extending only partly through t] e bar, said re 2 5 cesses tapering or diminisning in depth from the center thereof and having tl eir centers in the same transverse plane, said bar being also provided with recesses formed in. tl.e corner edges thereof, intermediate of tlze o recesses in the faces and diminishing uniformly in depth from the longitudinal center to the ends thereof, substantially as specified. I 3. A bar for the purpose specified, said bar being polygonal in cross-section and having each face tltereof provided with diamond or 35 lozenge sl aped recesses, tlte centers of said recesses bein in the same transverse plane and said bar eing also provided with cornerrecesses intermediate of those in the faces and each dinlinisl ing unii'orrnl} in depth from tl:e longitudinal center to the ends tliereof, substantialtv as specified.

4. A bar for the purpose specified, said bar being polygonal in cross-section and l aving witlm each face t] ereof diamond or lozenge la d recesses, said recesses being slallow an diminisling uniformly in depth from t] e center tl'ereof to tie face of ti 0 bar, said bar being also provided with recesses in the corner edges tlereof intermediate of tie 5 former recesses and each diminisl ing uniformly in depth from tie longitudinal cen ter to the ends thereof, substantially as specitied.

in testimony wiereof l ailix my signatu' in tie presence of two \x'itnesses.

SYDNEY B. WILLIAMSON. Witnesses J. B. Bnonnmcn, It. \VILLIAMS. 

